[PATCH libinput 0/6] Middle mouse button emulation

[Peter Hutterer]

we already had middle mouse button emulation for softbuttons, but not on
physical buttons. This patchset adds support for physical buttons.

Couple of general notes:
* some devices, e.g. 2-button touchpads, have middle button emulation 
  enabled, but not exposed as config option
* if you have a middle button emulation is always off by default.
* pressing anything but left/right will stop emulation for this sequence, so
  you can't do an emulated middle button + back button or something. I'm not 
  aware of any workflow that actually requires this.

Cheers,
  Peter